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Help - unavailable product variant becomes available if you select different size first?

Hello everyone!

I’m encountering an odd technically difficulty on a client’s e-commerce site and I don’t really know where to begin to solve it.

We have a product with numerous variants (color, length, and width). One of the variants is unavailable (green plaid, Large, 1") and you’ll first notice it is greyed out like the photo below.

But if you proceed to select the 1.5" width, you’ll notice that 1" turns active and selectable, even though it is unavailable, as shown below.

Here’s a quick video link of this occurrence in action, as it’s hard to describe.

Any ideas why this is happening and how to fix it?

Here is my site Read-Only: